Bridge Calc: Draft & Ballast

Offline maritime calculators: Draft Survey, Ballast, Stability, Stowage & more

Bridge Calculators is a complete offline toolset for maritime professionals.

It provides essential marine calculators for deck officers, chief mates, and shipmasters to handle draft survey, ballast management, cargo stowage, vessel stability, and onboard calculations — all in one app.

Available Modules:

- Draft Survey Calculator

Manual & automatic cargo calculation based on draft readings and vessel particulars.

- Ballast Calculator

Calculate ballast water quantities by tanks (manual/automatic). Supports tank setup, tables, and geometry.

- Stowage Plan Calculator

Automatic cargo distribution by holds using stowage factor. Includes arrival/departure remarks.

- Cargo Trimming Calculator

Final trimming at loading completion. Calculates cargo quantity for even keel or target trim.

- Unit Converter

Convert maritime units: stowage factor, volume, length, speed, temperature.

- List / Heel Calculator

Calculate vessel list angle for stability and navigation assessment.

- Humidity Calculator

Find relative humidity from temperature & dew point.

- Squat & UKC Calculator

Estimate under keel clearance (UKC) and squat effect by draft and vessel speed.

- Draft & GM Change Calculator

Calculate draft and GM changes when moving between waters of different density.

Key Features:

1. Offline operation – all calculators work without internet.

2. Google Drive backup for Draft Survey & Ballast data.

3. Light & dark themes for day/night operations.

4. Clean, practical UI designed for onboard use.

Designed For:

- Deck officers and shipmasters performing daily calculations.

- Chief mates managing cargo operations and vessel stability.

- Professionals on bulk carriers, tankers, container ships, and general cargo vessels.

Bridge Calculators helps improve accuracy, safety, and efficiency in real-world vessel operations.